Commissariat a L'energie Atomique

Martine Drouet

Gaetan Pleyber

Robert Allemand

Edmond Tournier

Jean-Paul Bonnefoy

Henri Guers

A detection array for ionizing radiation tomography for obtaining the image of at least one section of an object or organ. The array has at least one chamber (1) provided with a radiation-transparent entrance window (2) and in the chamber a detection stack (E1) incorporating a conductive polarizing plate (3) parallel to the sectional plane and a series of identical electrodes (5) parallel to the sectional plane. An insulating spacer (9) is placed between the electrodes (2) and the plate (5) and has, facing the window, at least one radiation-opaque intermediate plate (14) parallel to the sectional plane. This intermediate plate (14), the electrodes (5) and the polarizing plate (3) are disturbing elements which, separated by a distance d, make it possible to eliminate the artefacts for linear or quasi-linear inclusions in the object.

Detection array for ionizing radiation tomography

The invention concerns an X-ray tomographic detector. This detector comprises a sealed chamber (4) containing a gas able to be ionized by X-rays having traversed a device or an object. This chamber comprises on a front face an X-ray inlet gate (5) and contains an X-ray detection unit (11). Connections means (27, 28, 29, 32, 33) traversing a rear face of the chamber (9) to link the detection means to measuring (14) and feed (15, 16) means outside the chamber. The detection means comprise electrodes (19) and a polarization plate (18) separated by an insulating brace (3) transparent to X-rays. According to the invention, this brace has the shape of frame. This frame rests firstly on the polarization plate (18) and secondly on conductive strips (22, 24) brought to the same potential reference (16) as that of the electrodes. Application for X-ray tomography.

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Pierrefitte, France

Martine Drouet